The young man involved in an affair with the First Minister's wife has been named as Kirk McCambley in a television documentary which claimed both Iris and Peter Robinson broke parliamentary rules over a £50,000 loan.
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The documentary alleged Mrs Robinson organised two loans to help her lover set up a business in Belfast.
Mrs Robinson secured the money from two family friend developers so Kirk McCambley, 19, could open a restaurant on the banks of the River Lagan.
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But the Strangford MP faces claims that she did not declare an interest in the business despite sitting on the local council that awarded the tender to Mr McCambley.
The BBC documentary further alleged that her husband became aware of the situation but did not take steps to alert the appropriate authorities.
Mrs Robinson and Mr McCambley's affair lasted for around five months starting in the summer of 2008.
It ended after they rowed over the repayment of the money. Four months later, in March last year, the MP attempted to take her own life.
The pair had first become close after she comforted him following the death of his father and her friend, Billy.
"She looked out for me to make sure I was OK," her former lover, now 21, told the Spotlight programme.
Whistleblower
Selwyn Black, a former adviser to the MP who resigned after feeling uneasy about the loans issue, told the documentary she encouraged Mr McCambley to bid for the tender to run a cafe at the historic Lock Keeper's Cottage, a site the council Mrs Robinson sat on was redeveloping.
The programme claimed Mrs Robinson failed to register her financial interest in the scheme to her fellow councillors and did not record the two loans on her parliamentary declaration of interests.
Mr Black, who turned whistleblower to the investigation, said Mr Robinson became aware of the situation and in December 2008 urged his wife to ensure both loans were repaid to developers Ken Campbell and Fred Fraser, who had since died.
"They both knew the consequences of what they had been involved in and did nothing to address that circumstance," said Mr Black.
"It goes right to the heart of credibility of government in Northern Ireland."
Mrs Robinson stepped down from politics last month, citing a long battle with depression.
She issued a sensational statement on Wednesday revealing her affair and her subsequent suicide attempt.
The programme was told she was too unwell to answer the allegations.
On Wednesday, Mr Robinson told the media he was aware of the claims and was confident he had done nothing wrong.
"During the course of yesterday (Tuesday) I received a letter from one of the organisations within the BBC.
"It contained no allegation against me, it asked questions which are easily answered but there is no allegation that will stand."
On Thursday night, a DUP spokesman said: "Following allegations made about Peter Robinson in the BBC's Spotlight programme on Thursday 7th January 2010, Mr Robinson will be consulting his legal team on Friday."
'Confidence'

Earlier, the DUP had rallied behind the First Minister, after Peter Robinson met Deputy First Minister Martin McGuinness for devolution talks at Stormont.
The east Belfast MP briefed DUP ministers and deputy leader Nigel Dodds following the afternoon's meeting with Mr McGuinness.
"The party I believe has full confidence in Peter's leadership and want to see him continue to do the excellent role that he has done already as First Minister," Nigel Dodds told UTV.
"There is a great deal of sympathy and concern at a personal level and Peter should be given and the family, space to deal with that personal, private family matters but clearly he is back to work in his public office," he added.
Mr Robinson also went to his Belfast constituency office, his wife Iris' base in nearby Newtownards and DUP headquarters in Belfast, where he told staff it was "business as usual".
Iris Robinson started her "brief" affair weeks after quoting the Bible and describing homosexuality as an abomination.
"A lot of the gay people in Northern Ireland will feel kind of vindicated by what we have seen develop over the last day or two", Andy Thompson from the gay rights group Outrage told UTV.
"This is a woman who really brought morals into politics whenever she decided to wave her finger at other people at what their private practices were and it's just very interesting to see the hypocrisy in all of that now that she has been shown to have an inappropriate relationship of her own," he said.
© UTV News